CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEMBERS'/SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Members' Equity	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in Shares/Units) at Sep. 30, 2019		1,527
Beginning balance at Sep. 30, 2019		$ 149,383
Issuance of common units under long-term incentive plan (in Units)		15
Purchase of common units under long-term incentive plan (in Units)		(2)
Purchase of common units under long-term incentive plan		$ (194)
Dividends on preferred units		(864)
Dividends on common units		(4,997)
Unit-based compensation expense		153
Net income (loss)		$ (6,841)
Ending balance (in Shares/Units) at Dec. 31, 2019		1,540
Ending balance at Dec. 31, 2019		$ 136,640
Beginning balance (in Shares/Units) at Sep. 30, 2019		1,527
Beginning balance at Sep. 30, 2019		$ 149,383
Dividends on preferred units	$ (2,631)
Net income (loss)	40,228
Common shares issued for business combination	0
Ending balance (in Shares/Units) at Jun. 30, 2020		1,555
Ending balance at Jun. 30, 2020		$ 174,808
Beginning balance (in Shares/Units) at Dec. 31, 2019		1,540
Beginning balance at Dec. 31, 2019		$ 136,640
Issuance of common units under long-term incentive plan (in Units)		16
Purchase of common units under long-term incentive plan (in Units)		(1)
Purchase of common units under long-term incentive plan		$ (124)
Dividends on preferred units		(877)
Dividends on common units		(4,988)
Unit-based compensation expense		206
Net income (loss)		$ 75,053
Ending balance (in Shares/Units) at Mar. 31, 2020		1,555
Ending balance at Mar. 31, 2020		$ 205,910
Purchase of common units under long-term incentive plan (in Units)		0
Purchase of common units under long-term incentive plan		$ (4)
Dividends on preferred units		(890)
Dividends on common units		(2,515)
Unit-based compensation expense		291
Net income (loss)	(27,984)	$ (27,984)
Ending balance (in Shares/Units) at Jun. 30, 2020		1,555
Ending balance at Jun. 30, 2020		$ 174,808
Beginning balance (in Shares/Units) at Sep. 30, 2020		1,555	0
Beginning balance at Sep. 30, 2020	0	$ 166,617	$ 0	$ 0	$ 0
Issuance of common units under long-term incentive plan (in Units)		13
Dividends on preferred units	0	$ (917)
Dividends on common units	0	(3,801)
Unit-based compensation expense	0	413
Net income (loss)	0	$ (7,941)
Ending balance (in Shares/Units) at Dec. 31, 2020		1,568	0
Ending balance at Dec. 31, 2020	0	$ 154,371	$ 0	0	0
Beginning balance (in Shares/Units) at Sep. 30, 2020		1,555	0
Beginning balance at Sep. 30, 2020	0	$ 166,617	$ 0	0	0
Dividends on preferred units	0
Net income (loss)	(81,320)
Common shares issued for business combination	26,392
Ending balance (in Shares/Units) at Jun. 30, 2021		0	18,022
Ending balance at Jun. 30, 2021	164,628	$ 0	$ 18	223,918	(59,308)
Beginning balance (in Shares/Units) at Dec. 31, 2020		1,568	0
Beginning balance at Dec. 31, 2020	0	$ 154,371	$ 0	0	0
Purchase of common units under long-term incentive plan (in Units)		(3)
Purchase of common units under long-term incentive plan	0	$ (191)
Dividends on preferred units	0	$ (574)
Preferred units converted to common units (in Units)		512
Preferred units converted to common units	0	$ 61,196
Dividends on common units	0	(3,770)
Unit-based compensation expense	0	$ 276
Restricted common shares issued in exchange for common units issued under long-term incentive plan (in shares)		(24)	198
Common stock issued in exchange for common units (in Shares)		(2,053)	16,733
Common stock issued in exchange for common units	192,191	$ (192,191)	$ 17	192,174
Common shares issued for business combination (in Shares)			891
Common shares issued for business combination	26,392		$ 1	26,391
Restricted common shares issued			3
Share-based compensation expense	409			409
Dividends declared	(4,991)				(4,991)
Ending balance (in Shares/Units) at Mar. 31, 2021		0	17,825
Ending balance at Mar. 31, 2021	181,240	$ 0	$ 18	218,974	(37,752)
Issuance of common units under long-term incentive plan (in Units)			197
Issuance of common shares under long-term incentive plan	4,165			4,165
Net income (loss)	(21,501)				(21,501)
Dividends paid	(55)				(55)
Share-based compensation expense	779			779
Ending balance (in Shares/Units) at Jun. 30, 2021		0	18,022
Ending balance at Jun. 30, 2021	$ 164,628	$ 0	$ 18	$ 223,918	$ (59,308)